油圧ポペット弁特性の測定とモデル化(機械力学,計測,自動制御)*

抄録

Firstly, steady-state performance of an oil hydraulic poppet valve was experimentally studied with 6 different poppet-seat combinations. In order to obtain as much detailed data as possible, the poppet displacement as well as the pressure drop and the flow rate were accurately measured. The results completely supported the validity of the new empirical equation which the present authors have proposed for a constriction with a variable opening area; a product of the pressure drop and the square of the opening area is proportional to a quadratic of the flow rate. A dynamic model for the poppet valve was also formulated on the basis of the static characteristics. Frequency response tests revealed that there was undeniable discrepancy between the experimental values and the predictions by the dynamic model. Concerning the response between the pressure drop and the poppet displacement, the discrepancy indicates considerable damping exists in the poppet motion. Moreover that in the pressure drop-flow rate response suggests the unsteady characteristics of the poppet constriction cannot be predicted by the steady-state ones.